KR20110030413A - Server device, license distribution method, and content receiving device - Google Patents

Abstract

It is possible to stabilize the operation of the license server by avoiding the concentration of license acquisition requests from a large number of clients immediately after starting the broadcast of the content. The web server 21 of the IPTV server requests the acquisition of the main license within a time until the predetermined setting time after the broadcast start time, in accordance with the license acquisition request for reproducing the encrypted content from the IPTV client terminal 10. The IPTV client terminal 10 temporarily sets the time, and includes a temporary license including information on the acquisition request time of the main license and a temporary content key corresponding to reproduction from the broadcast start time of the broadcast content to the predetermined setting time. To send). The license server 22 transmits the main license including the main content key corresponding to reproduction of the entire time of the content in accordance with the main license acquisition request executed on the information of the acquisition request time in the IPTV client terminal 10. do.

Description

Server device, license distribution method, and content receiving device {SERVER DEVICE, LICENSE DISTRIBUTION METHOD, AND CONTENT RECEIVING DEVICE}

The present invention relates to a server device that provides a license necessary for playing back content and content over a network, a license distribution method, and a content receiving device for acquiring a content required for playing back content and content and playing back the content.

IPTV (Internet Protocol Television) is a general term for a service or a broadcasting technology that distributes digital television broadcasting using IP. Thus, the apparatus using broadcast content by IPTV is called IPTV client terminal hereafter.

In general, when acquiring a license for reproducing content, a contract clause, a license use condition, and the like are presented to the user, and after confirmation, the license is delivered to the user. This process is often performed by a browser or the like capable of interacting with the server side (presentation and purchase confirmation of the contract clause etc. to the user), and between the user's IPTV client and the server (in this case, the purchase processing server). For authentication, a general authentication method using SSL (Secure Socket Layer), TLS (Transport Layer Security), or the like is adopted (for example, Patent Document 1). Therefore, server components such as security accelerators (special server devices capable of performing authentication processing of standard security protocols at a high speed) have become widespread on the server side.

[Patent Document 1] Japanese Patent Laid-Open No. 2006-031176 (paragraph 0044)

However, in recent years, with the increase in the amount of distribution of content through the network, implementation of a license acquisition protocol based on a more robust authentication method has been required as compared with the conventional general authentication method. Implementation of a license acquisition protocol that specializes in requirements is required. However, the authentication based on such a robust and special license acquisition protocol is more complicated in processing and a larger amount of calculation than in the general authentication method.

For this reason, when the license acquisition request from a large number of clients is concentrated in a short time period, for example, when playing content of a live program, the load on the server device may increase rapidly, resulting in unstable operation.

In view of such a situation, the present invention avoids the concentration of license acquisition requests from a large number of clients immediately after the start of content broadcasting, etc., and can stabilize the operation of license distribution processing, a license distribution method, and content. It is an object to provide a receiving device.

In order to solve the above problems, the server apparatus of the present invention, in accordance with a request for acquiring a license for reproducing encrypted broadcast content from a content receiving apparatus, maintains a main time within a time until a predetermined setting time after the broadcast start time. The license acquisition request time is randomly set, and the temporary license including information on the acquisition request time of this main license and the temporary content key corresponding to the reproduction from the broadcast start time of the broadcast content to the predetermined setting time is recalled. A main content key corresponding to reproduction of the entire time of the broadcast content according to a temporary license processing unit for transmitting to a content receiving device and the acquisition request of the main license executed on the basis of the information of the acquisition request time at the content receiving device; The main license containing the content receiving chapter A main license processing unit for transmitting to the device.

In the present invention, by randomly setting the main license acquisition request time, the server apparatus can avoid the concentration of license acquisition requests from a plurality of content receiving apparatuses immediately after the broadcast start of the contents. As a result, the operation of the server device can be prevented from becoming unstable due to excessive concentration of load.

When the server device of the present invention receives the license acquisition request from the content reception device, the server device receives a first authentication unit that performs user authentication by a first method and the acquisition request of the main license from the content reception device. It may be further provided with a 2nd authentication part which performs user authentication by a 2nd method with a high security strength compared with the said 1st system.

In the present invention, in the server apparatus which performs robust user authentication, it is possible to avoid the concentration of license acquisition requests from a plurality of content receiving apparatuses immediately after starting the broadcasting of the contents, etc., so that the operation of the server apparatus is excessively loaded. It is possible to more reliably prevent instability due to the concentration of.

In the server apparatus of the present invention, when the temporary license processing unit receives the request for acquiring the license from the content receiving apparatus more than a predetermined time before the broadcast start time of the broadcast content, the temporary license processing unit receives the request for acquiring the main license. The information indicating that the main license can be transmitted immediately may be transmitted to the content receiving apparatus.

Further, when the temporary license processing unit receives the request for acquiring the license from the content receiving apparatus after a predetermined setting time after the broadcast start time of the broadcast content, the main license is obtained for the request for acquiring the main license. May be transmitted to the content receiving apparatus, indicating that the transmission of the message is possible immediately.

According to another aspect of the present invention, a license distribution method is provided in accordance with a request for acquiring a license for reproducing encrypted broadcast content from a content receiving apparatus, wherein the main license is released within a time period up to a predetermined setting time after the broadcast start time. The content is obtained by temporarily setting an acquisition request time and receiving a temporary license including information on the acquisition request time of the main license and a temporary content key corresponding to reproduction from the broadcast start time of the broadcast content to the predetermined setting time. The main license transmitted to a device, the main license including a main content key corresponding to reproduction of the entire time of the broadcast content according to the acquisition request of the main license executed on the basis of the information of the acquisition request time at the content receiving device; Is transmitted to the content receiving device.

A content receiving device based on another aspect of the present invention transmits a request for acquiring a license for reproducing encrypted broadcast content to a first server device and, as a response from the first server device, is determined after a broadcast start time. Acquires a temporary license including information of a main license acquisition request time that is randomly set within a time up to a setting time of and a temporary content key corresponding to reproduction from the broadcast start time of the broadcast content to the predetermined setting time And a request for acquiring the main license to the second server device based on the temporary license acquisition requesting unit and the information on the acquisition request time of the main license acquired in the first license acquisition requesting unit. In response, a main content key corresponding to playback of the entire time of the broadcast content is included. Decoding the encrypted broadcast content using a main license acquisition request unit for acquiring the main license, a temporary content key acquired in the temporary license acquisition request unit, and a main content key acquired in the main license acquisition request unit; A part is provided.

According to the present invention, it is possible to stabilize the license distribution processing by avoiding the concentration of license acquisition requests from a large number of clients immediately after the start of content broadcasting and the like.

1 is a diagram illustrating a configuration of an IPTV system according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a content reproduction sequence in the IPTV system of FIG. 1. FIG.
3 is a diagram illustrating an example of a content list page.
4 is a diagram illustrating an example of a page for license purchase.
5 is a diagram for explaining a method for determining a main license acquisition request timing.
6 is a flowchart showing a procedure of generating a main license acquisition request timing;
Fig. 7 is a flowchart showing a method of setting Tp based on frequency prediction of license acquisition request.
Fig. 8 is a diagram showing an XML schema that defines the structure of DRMControlMessage.
FIG. 9 is a diagram illustrating the XML schema of FIG. 8 in a text format. FIG.
10 is a diagram illustrating an example of a DRMControlMessage based on the XML schema of FIGS. 8 and 9.
11 is a block diagram illustrating an exemplary configuration of hardware of a computer.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail using drawing.

1 is a block diagram showing the configuration of an IPTV system 100 according to an embodiment of the present invention.

As shown in Fig. 1, the IPTV system 100 of this embodiment is capable of delivering content by IPTV client terminal 10, which is a content receiving apparatus, by streaming or downloading, etc., and also requires a license for playing the content. It consists of an IPTV server 20 for distributing the network 30 and a connection thereof.

The IPTV client terminal 10 is, for example, a terminal device such as a personal computer (PC), a set top box, or a TV. The IPTV client terminal 10 includes a user interface 11, a web browser 12, a digital rights management (DRM) client 13, an IPTV media client 14, a client database 15, and the like.

Specifically, the IPTV server 20 is composed of one or a plurality of server devices. Here, the case where the IPTV server 20 is comprised by the some server apparatus is demonstrated. The IPTV server 20 includes a web server 21, a license server 22, an IPTV media server 23, a server database 24, and the like.

Next, a detailed configuration of the IPTV client terminal 10 will be described.

The user interface 11 processes input and output to the user 1. For example, the user interface 11 inputs various commands from the user 1 and delivers them to the web browser 12, the DRM client 13, the IPTV media client 14, the web browser 12, A process of visually posting various types of information from the DRM client 13 and the IPTV media client 14 to the user 1 is performed.

The web browser 12 obtains the metadata of the content from the metadata server (not shown) of the IPTV server 20 in advance in the client database 15 and displays a list of the contents based on the metadata. With respect to this content list, the user can select the content to be played back through the user interface 11 and send the web browser 12 a request for obtaining a license necessary for playing the content.

Here, the metadata of the content is required for accessing the content access information such as the content ID, the content name, the Uniform Resource Identifier (URI) that is the access destination of the content, and the license server 22 that is the distributor of the license for playing the content. Information such as access information, broadcast time (start time, end time), attributes and contents of content, and whether or not a license for playing the content has been purchased is included.

In addition, the web browser 12 obtains, as a response from the web server 21 to the temporary license acquisition request, a temporary license including the temporary content key Kcp and a DRMControlMessage including timing information of the main license acquisition request. This DRMControlMessage is provided to the IPTV media client 14 along with a content playback instruction. Here, the temporary license is a license necessary for reproducing the time period from the predetermined broadcast start time to the predetermined setting time in the content. On the other hand, a main license is a license required for reproducing contents of the entire time. These temporary licenses and the main license will be described in detail later.

When the IPTV media client 14 receives the content playback instruction from the web browser 12, the IPTV media client 14, based on the metadata of the content stored in the client database 15, to the IPTV media server 23 that distributes the content. The data of the encrypted content is accessed, the data of the encrypted content is decrypted using the temporary content key Kcp included in the DRMControlMessage, and the reproduction processing is performed. When the IPTV media client 14 acquires the main license from the DRM client 13, the IPTV media client 14 decodes and plays back the content obtained from the IPTV media server 23 using the main content key Kc included in the main license. The process is performed.

The DRM client 13 extracts the temporary content key Kcp included in the temporary license from the DRMControlMessage and delivers it to the IPTV media client 14, or the IPTV server 20 based on timing information of the main license acquisition request described in the DRMControlMessage. A main license acquisition request is sent to the license server 22 of the license server 22, a main license including the main content key Kc sent from the license server 22 is obtained, and the main content key Kc is transferred to the IPTV media client 14. to provide.

The client database 15 is configured with a storage device such as a hard disk drive or a semiconductor memory, for example, and stores content metadata and the like obtained from the IPTV server 20.

Next, the configuration of the IPTV server 20 will be described in detail.

In response to a request for obtaining a temporary license from the web browser 12 of the IPTV client terminal 10, the web server 21 performs user authentication, license purchase confirmation, and the like, and succeeds in user authentication. If so, a DRMControlMessage including a temporary license including the temporary content key Kcp and acquisition request timing information of the main license is generated and responds to the web browser 12 of the IPTV client terminal 10. The method of generating this DRMControlMessage will be described later.

According to the main license acquisition request from the DRM client 13 of the IPTV client terminal 10, the license server 22 is more robust, has more processing procedures, and has a larger calculation amount than the authentication method of the browser standard described above. If the user authentication in the system is successful and the user authentication is successful, the main purchase including the main content key Kc is performed when the license purchase history of the user stored in the server database 24 is checked to confirm that the license purchase has been completed. The license is distributed to the DRM client 13.

The IPTV media server 23 distributes the data of the encrypted content in accordance with the request of the content from the IPTV media client 14.

Next, in this IPTV system 100, the IPTV client terminal 10 obtains the content and the temporary content key Kcp and the main content key Kc for playing the content from the IPTV server 20, and uses the content. The operation in the case of playing back will be described.

2 is a diagram illustrating a content reproduction sequence in the IPTV system 100.

First, the user 1 of the IPTV client terminal 10 instructs the web browser 12 via the user interface 11 to display a list page of contents based on the metadata maintained in the client database 15. do. According to this instruction, the web browser 12 creates a list page of contents based on the metadata stored in the client database 15 and posts it to the user 1 via the user interface 11.

3 shows an example of a list page of this content. The content list page includes a still image thumbnail of the content for each content, the name of the content, the property of the content (recommended program, new year program, R-designated program, etc.), the content of the content (genre, video / audio mode, paid / free), A mark 41 indicating that a license for reproducing the content can be purchased (not licensed), a mark 42 indicating that the content can be reproduced (licensed purchase completed), and the like are displayed.

Here, the mark 41 indicating that a license can be purchased (not licensed) has a function as a click button. When the mark 41 of arbitrary content is clicked by the user 1, for example, as shown in Fig. 4, the user 1 selects the technical text of the purchase contract matter of the license and the acceptance / disapproval of the purchase. The page on which the button is placed is displayed. When the accept button is clicked by the user 1 on this page, the web browser 12 extracts the content ID corresponding to the content selected by the user 1 from the metadata, and the content ID and the user ID. And a temporary license acquisition request including the password to the web server 21 of the IPTV server 20 (step S101).

When the web server 21 of the IPTV server 20 receives a temporary license acquisition request from the web browser 12 of the IPTV client terminal 10, the web server 21 of the IPTV server 20 receives an example based on the user ID and password included in the temporary license acquisition request. For example, user authentication is performed by a browser standard authentication protocol such as SSL or TLS. If the user authentication is successful, the web server 21 determines whether or not the user has purchased a license for reproducing the content corresponding to the content ID of the user stored in the server database 24. It confirms with reference to a license purchase history (step S102). This time, the history of purchasing a license for reproducing the content does not remain in the license purchase history of the user. Therefore, the web server 21 of the IPTV server 20 stores the current license purchase information in the license purchase history of the user (step S103).

Next, the web server 21 of the IPTV server 20 generates a DRMControlMessage including a temporary license including the temporary content key Kcp and the acquisition request timing information of the main license to generate a web browser of the IPTV client terminal 10. It transmits to (12) (step S104). Here, as the temporary content key Kcp, one prepared in advance for each content is used. The main license acquisition request timing information is information for specifying the time when the DRM client 13 of the IPTV client terminal 10 transmits the main license acquisition request.

Next, an outline of a method of determining the main license acquisition request timing will be described with reference to FIG. 5. Ts is the broadcast start time of the content, Te is the broadcast end time of the content, Tp is the end time of the content that can be decoded by the temporary content key Kcp, and is a predetermined time for each content. The time from the broadcast start time Ts to Tp is, for example, several seconds or several minutes. The period in which decoding is possible by the main content key Kc is from Ts to Te. Tacq is an example of the main license acquisition request timing. The web server 21 of the IPTV server 20, when the time Tx at which the purchase of the license was established (the time at which the license purchase information is stored) Tx occurs from the broadcast start time Ts to the Tp of the content, purchase of the license is not made. A time randomly determined from the established time Tpurchase to Tp is referred to as the main license acquisition request timing Tacq.

The web server 21 of the IPTV server 20 generates a DRMControlMessage using the above main license acquisition request timing information and the temporary content key Kcp, and sends it to the web browser 12 of the IPTV client terminal 10 (step). S104).

When the web browser 12 of the IPTV client terminal 10 obtains a DRMControlMessage from the web server 21 of the IPTV server 20, the web browser 12 provides the DRMControlMessage to the IPTV media client 14 with a content playback instruction (step). S105).

When the IPTV media client 14 receives the DRMControlMessage from the web browser 12 together with the content playback instruction, the IPTV media client 14 provides the DRMControlMessage to the DRM client 13 and requests the extraction of the temporary content key Kcp from the DRMControlMessage. (Step S106).

Based on the request from the IPTV media client 14, the DRM client 13 extracts the temporary content key Kcp included in the temporary license from the DRMControlMessage and delivers it to the IPTV media client 14 (step S107).

When the IPTV media client 14 obtains the temporary content key Kcp from the DRM client 13, the IPTV media client 14 accesses the IPTV media server 23 that distributes the content based on the metadata of the content stored in the client database 15. The data of the encrypted content is obtained, and the data of the encrypted content is decrypted using the temporary content key Kcp to perform a reproduction process (steps S108 and S109). As a result, in the IPTV client terminal 10, the reproduction of the content in the time zone at least from the broadcast start time Ts to Tp is ensured.

On the other hand, the DRM client 13, based on the main license acquisition request timing information described in the DRMControlMessage, the main license including the content ID, the user ID, the password, etc. to the license server 22 of the IPTV server 20. The acquisition request is transmitted (step S110). That is, the DRM client 13 transmits a main license acquisition request to the license server 22 of the IPTV server 20 at the time indicated by the main license acquisition request timing information.

When the license server 22 of the IPTV server 20 receives the main license acquisition request from the DRM client 13 of the IPTV client terminal 10, the license server 22 is more robust than the browser protocol authentication protocol described above. There are many procedures and user authentication is performed by the method with large calculation amount (step S111). When the user authentication succeeds, the license server 22 of the IPTV server 20 uses a license for reproducing the content corresponding to the content ID based on the content ID, user ID, and the like included in the main license acquisition request. Whether or not the purchase has been completed is checked with reference to the license purchase history of the user stored in the server database 24 (step S112). If it is confirmed that the license server 22 of the IPTV server 20 has completed the purchase of the license, the license server 22 distributes the main license including the main content key Kc to the DRM client 13 (step S113).

When the DRM client 13 obtains the main license including the main content key Kc from the license server 22, the DRM client 13 provides the main content key Kc to the IPTV media client 14 (step S114).

When the IPTV media client 14 acquires the main content key Kc from the DRM client 13, the IPTV media client 14 decodes the content obtained from the IPTV media server 23 using the main content key Kc to perform a playback process (step S115). ). As a result, the IPTV client terminal 10 performs a reproduction process up to the final time of the content.

Next, the generation procedure of the main license acquisition request timing is explained with reference to FIG.

When the purchase of a license is established (if license purchase information is newly stored in the server database 24) (step S201), the web server 21 of the IPTV server 20 starts broadcasting of the content. It is determined whether or not the time before the Ts is a time before the TbeforeStart. Here, the time TbeforeStart before the broadcast start time Ts is a time that can be given sufficient time with respect to the broadcast start time Ts so as to avoid load concentration on the server apparatus, for example, for example, the broadcast start time Ts. It is the time of 1 day before.

When the web server 21 of the IPTV server 20 determines that the establishment time Tpurchase of the license purchase is earlier than the time TbeforeStart in this determination, the main license acquisition request timing information Tacq is between the time Tpurchase and the Tp. The DRMControlMessage which does not contain the temporary content key Kcp is generated by setting the main license acquisition request timing information Tacq to " -1 " (step S206), and the web of the IPTV client terminal 10 is generated. Send to browser 12.

In addition, when the web server 21 of the IPTV server 20 determines in step S202 that the establishment time Tpurchase of the license purchase is later than the time TbeforeStart, the establishment time Tpurchase of the license purchase is earlier than Tp. It is determined whether or not (step S203). In the case of YES, the web server 21 of the IPTV server 20 sets the main license acquisition request timing information Tacq to be a randomly determined time between the time Tpurchase and the Tp at which the license was purchased ( Step S204). In the case of NO, the web server 21 next determines whether or not the time Tpurchase at which the license is purchased is between Tp and the broadcast end time Te of the content (step S205). If YES, the web server 21 of the IPTV server 20 generates a DRMControlMessage that does not include the temporary content key Kcp with the main license acquisition request timing information Tacq "-1" (step S206). ), And transmits this to the web browser 12 of the IPTV client terminal 10.

When the DRM client 13 of the IPTV client terminal 10 knows that the main license acquisition request timing information Tacq described in the DRMControlMessage is "-1", the DRM client 13 sends the license server 22 of the IPTV server 20 to the license server 22. In response to this, a request for obtaining a main license including a content ID, a user ID, a password, and the like is immediately sent. In other words, when the license is purchased in a time zone in which the load is not concentrated on the license server 22, the IPTV client terminal 10 immediately transmits a request for acquiring the main license to the IPTV server 20, thereby obtaining the main license. It can be acquired. Therefore, in this case, in the IPTV client terminal 10, the encrypted content obtained from the IPTV media server 23 can be decrypted using the main content key Kc from the broadcast start time Ts of the content to perform the playback process.

By the way, Tp is the end time of the content which can be decoded by the temporary content key Kcp, and it has already demonstrated that it is predetermined time for every content. When setting the Tp in the IPTV server 20, the Tp may be set based on the frequency prediction of the license acquisition request for the content.

Fig. 7 is a flowchart showing a method of setting Tp based on the frequency prediction of this license acquisition request. In this example, the frequency of the license acquisition request is set in accordance with the broadcast time zone of the content. That is, the calculation method of Tp is changed between content which starts broadcasting between 7pm-9pm, so-called "golden time", and other content (step S301). Regarding the content that starts broadcasting at golden time, reception of license acquisition requests from more users is predicted, so that the time from broadcast start time Ts to Tp is set longer (step S301). On the contrary, for the content in which broadcasting is not started at golden time, the time from the broadcast start time Ts to Tp is set short (step S302). Thereby, Tp can be set favorably according to the frequency of a license acquisition request. In addition, in Fig. 7, Zlarge is 1 or more, a larger setting number than Zsmall, Zsmall is 1 or more, and a smaller setting number than Zlarge.

Next, an example of XML schema that defines the structure of DRMControlMessage will be described.

8 and 9 are diagrams showing an XML schema that defines the structure of DRMControlMessage. In the DRMControlMessage 50, as a child element of the MarlinLicenseWithActionTokenType element 51, a MarlinTemporaryLicense element 52 for storing a temporary license and a MarlinActionToken element capable of storing the main license acquisition request timing as a value of the AcquisitionTiming attribute 54 ( 53).

10 is an example of DRMControlMessage based on the XML schema of this DRMControlMessage. In this example, the text string is stored as "aMarlinTemporaryLicense" as the MarlinTemporaryLicense element 52. In other words, this "aMarlinTemporaryLicense" is the temporary content key Kcp. The MarlinActionToken element 53 stores "June 3, 2008 at 12:00" as the main license acquisition request timing which is the value of the AcquisitionTiming attribute 54.

11 is a block diagram showing an example of the hardware configuration of a computer that executes the above-described series of processes by a program.

In the computer 200, the CPU (Central Processing Unit) 201, the ROM (Read Only Memory) 202, and the RAM (Random Access Memory) 203 are connected to each other by the bus 204.

An input / output interface 205 is further connected to the bus 204. The input / output interface 205 includes an input unit 206 composed of a keyboard, a mouse, a microphone, and the like, an output unit 207 composed of a display, a speaker, and the like, a storage unit 208 composed of a hard disk, a nonvolatile memory, and the like, and a network interface. The drive unit 210 for driving the removable media 211, such as a communication unit 209, a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like, is connected.

In the computer 200 configured as described above, the CPU 201 loads, for example, a program stored in the storage unit 208 into the RAM 203 via the input / output interface 205 and the bus 204. By executing, the above-described series of processes are performed.

The program executed by the computer 200 may be a program that is processed in a time series according to the procedure described herein, or may be a program that is processed in a necessary timing such as when the call is made in parallel or when a call is made. do.

The program may be processed by one computer or may be distributed by a plurality of computers. In addition, the program may be transmitted to a remote computer and executed.

As described above, according to this embodiment, in the IPTV server 20, in particular, the license server 22 which performs robust user authentication, license acquisition requests from a plurality of IPTV client terminals 10 at the time of broadcast start of content. Concentration on the back immediately can be avoided. As a result, the operation of the license server 22 can be prevented from becoming unstable due to excessive concentration of load.

Further, according to this embodiment, since the temporary content key Kcp is distributed from the IPTV server 20 before the license (main license) is formally acquired in the IPTV client terminal 10, Tp from the broadcast start time Ts of the content. Content playback for the period up to is guaranteed. In addition, the IPTV client terminal 10 which has completed the purchase of the license between the broadcast start time Ts and the Tp of the content is the main license from the IPTV server 20 between the establishment time Tpurchase and Tp of the purchase of the license. Can be obtained, so that playback of the content can continue even after Tp.

In addition, embodiment of this invention is not limited to embodiment mentioned above, A various change is possible in the range which does not deviate from the summary of this invention.

10: IPTV client terminal
11: user interface
12: web browser
13: DRM client
14: IPTV Media Client
15: Client database
20: IPTV Server
21: Web server
22: License Server
23: IPTV Media Server
24: server database
30: network
100: IPTV system

Claims (6)

In accordance with a request for acquiring a license for reproducing the encrypted broadcast content from the content receiving apparatus, the acquisition request time of the main license is randomly set within the time until the predetermined setting time after the broadcast start time, A temporary license processing unit that transmits a temporary license including information of an acquisition request time and a temporary content key corresponding to reproduction from the broadcast start time of the broadcast content to the predetermined setting time, to the content receiving device;
The content receiving device comprising the main license including a main content key corresponding to reproduction of the entire time of the broadcast content in accordance with an acquisition request of the main license executed on the basis of the information of the acquisition request time in the content receiving device; The server apparatus provided with the main license process part which transmits to the. The first authentication unit according to claim 1, further comprising: a first authentication unit for performing user authentication according to a first method when receiving a license acquisition request from the content receiving device;
And a second authentication unit for performing user authentication by a second method having higher security strength than the first method when receiving the request for acquiring the main license from the content receiving device. The temporary license processing unit according to claim 2, wherein, when the temporary license processing unit receives the request for acquiring the license from the content receiving device more than a predetermined time before the broadcast start time of the broadcast content, the main license is acquired for the main license. The server apparatus which transmits the information which shows that license transmission is possible immediately to the said content receiving apparatus. The request for acquiring the main license according to claim 3, wherein the temporary license processing unit receives a request for acquiring the license from the content receiving device after a predetermined setting time after a broadcast start time of the broadcast content. And the server apparatus which transmits to the content receiving apparatus information indicating that the transmission of the main license is possible immediately. In accordance with a request for acquiring a license for reproducing the encrypted broadcast content from the content receiving apparatus, the acquisition request time of the main license is randomly set within the time until the predetermined setting time after the broadcast start time, A temporary license including information of an acquisition request time and a temporary content key corresponding to reproduction from the broadcast start time of the broadcast content to the predetermined set time, is transmitted to the content receiving device,
The content receiving device comprising the main license including a main content key corresponding to reproduction of the entire time of the broadcast content in accordance with an acquisition request of the main license executed on the basis of the information of the acquisition request time in the content receiving device; License distribution method to send to. A main license that is randomly set within a time from a broadcast start time to a predetermined setting time as a response from the first server device, by sending a request for obtaining a license for playing encrypted broadcast content to the first server device. A temporary license acquisition request unit for acquiring a temporary license including information of an acquisition request time of a temporary content key and a temporary content key corresponding to reproduction from the broadcast start time of the broadcast content to the predetermined setting time;
The acquisition request of the main license is sent to a second server device based on the information of the acquisition request time of the main license acquired by the first license acquisition request unit, and as a response from the second server device, the entire broadcast content is received. A main license acquisition request unit for acquiring the main license including a main content key corresponding to reproduction of time;
And a decoding unit for decoding the encrypted broadcast content by using the temporary content key acquired by the temporary license acquisition request unit and the main content key obtained by the main license acquisition request unit.

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